/Engine/Plugins/FX/Niagara/Source/Niagara/Classes/NiagaraDataInterfaceAudioSpectrum.h
Sample value from the spectrum buffer.
Amplitude at this position. 0.0 corresponds to the nosie floor, while 1.0 corresponds to full volume. Some values may exceed 1.0.
float GetSpectrumValue ( float InNormalizedPositionInSpectrum, int32 InChannelIndex )